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Zero
Introduction

Introduction

What Zero is, the words its docs use, and which page to read first.

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Zero is a Mac app for coding agents. It runs Claude Code, Codex and OpenCode, each signed in with your own account. You give an agent a job and a folder to work in. When it needs you, it asks in the inbox, where every agent asks and you answer.

The parts of Zero

  • The window. Your tasks and their conversations. The rail on its left side leads to Home, the Inbox, Later, Scratchpads, Loops, Integrations and Settings.
  • The control bar. A small bar on the right edge of your screen. It shows the inbox and a mark for each task. It keeps your agents in view while you work in another app.
  • The inbox. Everything your agents have asked you: questions, choices, commands to allow. It opens beside the control bar, and it’s also a page in the window.
  • The iPhone app. Your inbox and tasks on your phone, coming soon.

Words these docs use

  • Task: one agent that works on one job, in one folder. Each task has a conversation, like a chat.
  • Worker: a task that another task started for part of its job. It shows under the task that started it, and it reports back to that task.
  • Ask: something an agent needs from you, such as an answer, a choice or your go-ahead.
  • Account: a sign-in for Claude Code, Codex or OpenCode that Zero keeps and gives to the agent.
  • Project: a folder on your Mac that you added to Zero. Tasks start in a project.
  • Workspace: a set of tasks kept apart from the rest, such as your own projects and your job. Each task belongs to one workspace.

Where to start

New to Zero? Start with Getting started. Then:

Page What it covers
Tasks and workers Starting a task, talking to it while it works, and following its workers.
The inbox and asks Every kind of ask, and how to answer.
The control bar The bar on the edge of your screen.
Accounts and models Signing in agents, and picking models.
Workspaces and folders Keeping tasks apart, and telling Zero where your projects are.
Later, scratchpads and loops Saving things for later, notes agents can read, and instructions you hand agents by name.
Following and integrations Agents watching pull requests and issues, and the services you connect.
Browsers and MCP servers Letting agents use your browser, and giving them more tools.
Settings Every setting: what it does and where it is.
Keyboard shortcuts Every key Zero answers to.
The iPhone app Zero on your phone.
The zero command How agents reach you.
Troubleshooting What to do when something doesn’t work.

Zero’s code

Zero is free and open source, under the GNU General Public License v3 or later. The code is on GitHub. To help build Zero, read CONTRIBUTING.md first.